Edge grinding and polishing machine



C. BROWN.

EDGE GRINDING AND POLISHING MACH'IN E. APPLICATION FILED SEPT-21, 1918.RENEWED DEC. 10, 1920.

1,380,133. Patented May 31, 1921.

lHllIllIl l l ll INVENTOR rhren'r OFFICE.

orinrsrornnnimown, or demeanor; rnnnsiz'tvnivm, Ass renon TO rrrrsnnneirTamil whom Emmy con irm- L d Be it known that I, CHRIsToPHnRBRoWN,

' 1. a citizen of the United gtates, and a resi-j dentof Gharleroi, inthe county of Washingtonand State of. Pennsylvania, have made a new anduseful Invention in Edge. Grinding and Polishing Machines, OfWlllQlL thefollowingis a s ecification.

"The invention re ates to machines for grinding or polishing the edgesof circular glass or stone plates or sheets. It has for its principalobjects the provision of a machine.

. miwhich theplate of material being operprising the cone pulley 3,driven from the is splined the. operating spindle 8 of the atedupon issecurely maintained in centered position with, a relatively slightapplication of clamping force; the provision of a ma chine wherein thelabor of centering the sheet of material isreduced; and the proviimproved and simplified means for applying the abradingl element to theedgeof the plate of-material. One embodiment of the invention is illusi.trated' sion of a machine-havin in the accompanying drawings wherein: l1 v v Figure 1 is a side elevation of the machine with the lower ortionthereof partially in section and ig. 2 is a transverse section on theline II-II of Fig. 1.

Referring to the drawings 1 is the framework of the machine providedwith the laterally projecting bracket 2. Mounted above the. bracket isthe driving mechanism com belt 4: and the train of reducing gearing 5for driving thebeveledgear 6. This beveled gear drives the beveled gear7 through which machine.

The spindle is swiveled in the raising and lowering member 9 provided onits rear side with. the rack 10 which is moved up and down b% means ofthe pinion 11. As indicated in ig. 2 the pinion 11 is mounted upon theshaft 12 carrying at one end the hand-wheel 13 a and at the other endthe lever 14. which is loosely mounted upon the shaft. The extreme endof the shaft carrying the lever is provided with a toothed wheel 15adapted to be engaged by the latch member 16 extending longitudinally ofthe lever and normally held 1n advanced position by means of a spring(not shown). The latch member is retracted by means of a handle 17 Thesheet of glass or stone 18 (Fig. 1)

rLA'rn GLASS COMPANY, a conr'onarron or ,rnnnsrtvema."

E'neEeRmmNe em) ronrsi'nive MACHINE.

1 I p c fic tion of Lettersratent'. Patented. May 31, 1921. Applicationfiled Se tember 27,1918, serial 110-{255385. meta December 16, 1520..Serial No. 429,809. is held between the clamping members 19, and 20,such members being faced with felt or other fibrous material to increasetheirv grip upon theis'heetandi to prevent mar- -After the sheetofmaterial18 is centered between the; clamping members, the drivingmechan smiis thrown into operation to cause;

the rotation of the spindle 8 and theaconsequent rotation of theclamping members and the sheet held therebetween. The abrad-v ing. meansare then applied to the edgefiof the j sheet in the form ofthe block 2 1car riedby. the lever 25.3 This lever is removably-mounted in y the boxv26 which sure rounds the clamping members, its fulcrum being in thecorner ofthe box 27 as indicated in Fig. 2. Theblock 24 may be of anykind of abrading material such for instance as carborundum, the box 26serving to catch theparticles of abrasive and any liquid which may beemployed as. well as which isground ofithe edge the material of thesheet under treatment.

.The lever 14; serves togive a raising and lowering movement of limitedextent to the clamping member 19 and for the application ofpressuretomaintain the proper clamping engagement between, the clamping membersand the sheet or plate of material. The lever 14 is held inclamping-position by the weight 28 hung' removably thereon. Then it isdesired to move the rack and clamping member up a substantial distancethe lever 1a is released from the toothed member 15 and the hand-wheel13 is employed to give the necessary upward movement. The weight of thesheet or plate 18 tends to maintain it in centered position between theclamping members, which is not the case wherethe sheet is rotated in avertical plane, as has heretofore been common, and

the amount of clamping pressure by the clamping member 19 required inorder to give the sheet the necessary movement of rotation is not great,such pressure bein supplied by the weight of the parts inclu ing that ofthe spindle and the parts attached thereto and the weight carried by theoperating lever 14. It is also comparatively easy to center the sheet ofmaterial as it is easily shifted upon the member 20 to proper positionbefore the member 19 is applied. The lever 25 also serves as a simpleand convenient means for applying abrading pressure to the edge of thesheet since the lever has universal movement and can be instantlyremoved when desired 1n order to change the block 24 as conditions mayrequire. The edge of the sheet may be ground,

smoothed and polished without removing it from the machine. Otheradvantages incident to the construction will be readily apparent tothose skilled in the art.

What I claim is: v

1. In combination in a machine for grinding or polishing the edge ofcircular lates which comprises a pair of opposing 0 amping membersrotatable about a vertical axis,

an operating spindle for the upper one of said members located on saidaxis, a raising member provided with a rack in which said spindle isswiveled, a pinion" meshing with the rack, and means for rotating thespindle.

2. In combination in a machine for grinding or polishing the edges ofcircular plates which comprises a pair of opposing clamping membersrotatable about a vertical axis, an operating spindle for one of saidmem bers located on said axis, a pinion for raising and lowering theupper clamping member, a lever for rotating the pinion and normallyapplying pressure to lower such upper clamping member, and means forrotating said spindle.

3. In combination in a machine for grind-, ing or polishing the edges ofcircular plates which comprises a pair of opposing clamping membersrotatable about avertical axis,

anoperating spindle for the upper of. said clamping 'members located onsaid axis, a pinion for raising and lowering said spindle, a lever forrotating the pinion and normally applying pressure to lower the spindle,and means for rotating the spindle.

4. In combination in a machine for grinding or polishing the edges ofcircular plates which comprises a pair of opposing clamping membersrotatable about a vertical. axis, anoperat'ing spindle'for the upper'ofsaid clamping members located onsaid axis, a pinion forraising andlowering said spindle, a lever for rotating the pinion and normallyapplying pressure to lower the spindle, a

hand-wheel for rotating the pinion, and

sitions of adjustment, and means for rotat-v ing the spindle.

6. In combination in a machine forgrind'-= ing or polishingthe edges ofcircular plates which comprises a pairof opposing clampw ing membersrotatable abouta vertical axis an operating spindlefor the upper of saidclamping members locatedon" said axis, a

pinion for raising; and lowering said spindle,

a lever for rotating the'pinion, means where? by the lever, may beadjusted circumferentially with respect to the pinion'andfixed withrespect "theretoin its various positions of adjustment, or released,other means for rotating the pinion, and means for rotating i thespindle. V

7. In combination in a grinding or polishing machine, a pair of opposingclamping members rotatable about a vertical axis, an operating spindlefor the upper member, a

lever for raising and lowering the spindle,

and a weight releasably mounted upon the lever to apply the necessaryclamping'force.

In testimony whereof, I have hereunto subscribed my name this 18th dayofSeptember, 1918. f CHRISTOPHER BROWN

